as HTML is to tag, C++ is to? (what do you call things like cout and cin, etc.)

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as HTML is to tag, C++ is to? (what do you call things like cout and cin, etc.)

in my IDE (codeblocks) if I type something in (such as num) it gives me a list of things that start with num (numpunct, numeric value or whatever) and other things that I don't know. What do you call these things (streambuf, count, cout, cin, namespace, int, bool)?